Hi Ole, I think there is one more point, see inline ~~
On Sat, Dec 1, 2012 at 3:36 AM, Ole Trøan <[email protected]> wrote: > Med, et al, > > > Med: The rationale we adopted in this draft is as follows: > > > > * there are three major flavors: full stateful, full stateless, and > binding mode > > * all these modes can support assigning a full or a shared IPv4 address > > now you got me thinking, are these really the right modes from a CPE > perspective? > > let me try to explain, with my CPE implementor hat on, what "modes" would > make sense? > > - NAT placement. do I need a NAT on the CPE or not? > (no NAT && no IPv4 address == DS-lite) > - full IPv4 address assigned. > I can assign the IPv4 address to the tunnel endpoint interface, and use > that address for > local applications, and as the outbound address of the NAT > (mechanisms: MAP, Public 4over6) > - IPv4 prefix assigned: > I need to disable the CPE NAT, and use the assigned IPv4 prefix as my > LAN side DHCPv4 pool > (mechanism: MAP) > - Shared IPv4 address. > I must enable a local NAT, I cannot assign the IPv4 address on the "WAN" > interface, but only use it > for the outbound side of the NAT. > > then there might be a sub-modes for "tunnel endpoint determination" i.e. > how to determine an IPv6 tunnel end point address given an IPv4 destination > address and port. > 1) algorithmic (MAP) > 2) configured (Public 4over6, LW46, DS-lite) > > and a sub-mode for IPv4 address configuration: > 1) As "native IPv4" > (Public4over6, LW46) > 2) Embedded Address > (MAP) > 3) None > DS-lite > [Qiong] and a sub-mode for "source IPv6 address determiniation", how to determine the encapsulated IPv6 source address. 1) algorithmic, LAN prefix + embedded IPv4 address/PSID in Interface Identifier (MAP) 2) WAN IPv6 address (DS-Lite, LW46, Public 4over6) Right ? Best wishes Qiong > > does this make sense? > > cheers, > Ole > > > _______________________________________________ > Softwires mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/softwires > -- ============================================== Qiong Sun China Telecom Beijing Research Institude Open source code: lightweight 4over6: *http://sourceforge.net/projects/laft6/* PCP-natcoord:* http://sourceforge.net/projects/pcpportsetdemo/ * ===============================================
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